oardell



(No Model.) '2 Sheets-Sheet 1.

O. O. L. GARDELL & O. P. OSTERGREN.

BI GYGLE.

No. 596,960. I Patented Jan. 4, 1898.

INVENTORS, v W fi, Ki %M/9% WITNESSES: J4

W Attorney.

UNITED STATES PATENT rricn.

CllARLES O. L. CARDE LL, OF PEARL RIVER, AND OSCAR P. OSTERGREN, OF NEWYORK; N. Y.

B'ICYC LE.

SPECIFICATION forming part of Letters Patent No. 596,960, dated January4, 1898.

Application filed October 22, 1896- Serial No. 609,640. (No model.)

To all whom it may concern.- diskl. On the outer diskZisapawlm,pivotedBe it known that we, CHARLES O. L. CAR- to said disk at nand providedwith a spring 0, DELL, a citizen of the United States, residing tendingto keep it in engagement with a tooth at Pearl River, and OSCAR P.OSTERGREN. a of flange f, and on the inner disk is a pawl 2, 5 subjectof the King of Sweden and Norway, pivoted to said disk at g suitably forengageresiding at New York city, New York, have ment with a tooth offlange g, and will in invented new and useful Improvements in practicehave a like spring, as o, to keep it in Bicycles, of which the foilowingis a specifisuch engagement. cation. 1 On the frame-post 5 above thedisks is a IO Our invention consists of an improved bicyhook-pawlt forengagement with a hook-head cle attachment for storing energy when ineX- u of pawl m to hold it out of engagement with cess of what isrequired, as in descending flange f, and anotherhook-pawlr for engagegrades, and applying it again when resistance ment with end in of pawl11 to hold it out of is excessive, as in ascending grades, ashereengagement with flange 9, these two pawls :5 inafter described,reference being made to the being extended in opposite directions from aaccompanying drawings, in which' 7 center hub a", common to both andfitted on Figure 1 is a side elevation of part of a bithe pivot-stud y,whereon they turn together, cycle having our improved attachment. Fig.but in reverse directions. 2 is a transverse sectional elevation of theA rod .2 is connected to pawl r and to the 20 parts represented in Fig.1 on line '1 1. Fig. bell-crank a, pivoted on post .9 a suitable dis- 3is a detail in transverse section of part of tance above the pawls, andthe bell-crank is Fig. 1 on line 2 2. Fig. at is a detail inseeconnected by another rod 0 with the hand.- tion on line 1 1 of Fig..l on a larger scale for lever 61, mounted on the upper frame-bar egreater clearness. Fig. 5 is a side elevation atasuitable distanceforward of the saddle for 7 5 2 5 of the parts represented in Fig. 4,enlarged; being actuated by the rider to actuate the and Fig. 6 is aside elevation of part of the pawls t v. A latch f and notched bar g aredevices represented in Fig. 4, the rest cut off provided for securingthe lever in different on line 3 3, Fig. 4, also enlarged. 7 positions,and the lever has a joint at 7i to fa- On the crank-axle a andpreferably at the cilitate engaging and disengaging the latch 0 side ofthe axle-box Z) opposite to the sproeketwith the notched bar g byswinging the part wheel 0 we apply a sleeve d, at each end of of thelever carrying the latch laterally to which is a flange notched ortoothed on the said notched bar. 0 represents stops to limit edge forthe engagement of a pawl therewith, the movements of pawls t lhebell-crank said sleeve being intermediate of the crank e a is alsoconnected with the seat-spring 2" by 35 and the end of axle-box b andbeing keyed or a rod 3'' to actuate the pawls t e thereby in otherwisefirmly secured to the axle, so as to lieu of the hand-lever cl, whenpreferred, the

turn with it. The outer flange f has its teeth operation being asfollows: When going down so cut that a pawl engaged therewith will behill and the rider rests his whole weight on the carried around with thecrank-shaft when saddle and thereby depresses the hinder part, 0 4oturning in the direction for driving the mapawl 25 will be raised andwill release pawl m,

chine, and the inner flange g has itsteeth out which will then engageflange f, by which reversely, whereby a pawl engaging them and disk Zwill be turned through the action of the being impelled in the forwarddirection will crank-shaft, and the spring h will be wound tend to drivethe crank-shaft forward. On up, disk being then held stationary by pawl5 45 this sleeve d and between its flanges are two '0 engaging the end10 of pawl p, which, being disks fitted to turn freely and independentlypivoted on disk j, prevents its rotation during of each other andforming a case for a flat the winding of the spring.

coiled spring 71, which is duly fitted therein When going uphill and thesaddle is largely in the manner of a clock-spring, with its inn errelieved of the riders weight through greater I oo 50 end connected atz'to the hub of the inner disk application of weight on the pedals andrises j and its outer end connected at k to the outer in the hinderpart, the saddlespring i will raise rod 2 and swing pawl i down andengage its hook end with the hook end of pawl m, disengaging the latterfrom flange f and holding diskZ stationary,-while pawl 1; being freedfrom pawl Q), will engage flange g, so that the pull of the spring h onthe disk 3' will be expended in impelling effect on the crankshaft.

lVhen' the saddle and lever dare in the middle positions, both pawls 'mand p will be 7 disconnected from the flanges, the springwill nnwind,andthe attachment will be inactive.

The manner of controlling the attachment by the hand-lever d instead oithe saddle is obvious.

When in winding up the spring the limit is reached, excessive thrustwill be produced on the end of pawl mby notched disk f forcing the pawlout of the notch, spring being over powered, which through the shock itproduces willmake known to the rider that the spring is wound up, whenhe will make the necessary shift to utilize the power of the spring ifthen wanted, or allow it to run slack again if not yet required.

We claim as our invention 1. In a bicycle the combination with thecrank-axle, the driving sprocket-wheel thereon, and the usualdriving-cranks, of the auxiliary crank axle driving spring, said springbeing coiled around the axis of the crank-axle, means for coupling thespringat one end with the bicycle-frame, and coupling it at the otherend with the crank-axle for automatically winding up the spring by thepower of the moving machine independently of the cranks, and means forreversing these connections to utilize the stored energy of the springfor impelling the crank-axle in addition to the foot-power on thepedals, acting directly on the sprocket-wheel substantially asdescribed.

2. In a bicycle the combination with the crank-axle,-of the spring, andmeans controlled by the saddle subject to the pressure of the riderthereon for coupling the spring atone end with the bicycle-frame, andcoupling it at the other end with the crank-axle for winding up thespring by'the crank-axle substantially as described.

3. In a bicycle the combination with the crank-axle of the flangedsleeve secured thereto, the independently-movable disks thereon, aspring arranged intermediatelyof the disks and secured at one end to thehub of one disk and at the other end totheouter portion of the otherdisk, pawls pivoted on the disks for engaging the sleeve reversely,

the duplex pawl controlling the sleeveengaging pawls for engaging oneand disengaging the other respectively, and means for actuatingsaidduplex pawl substantially as described.

4. In a bicycle the combination with the crank-axle, of the flangedsleeve secured thereto, the independently movable disks thereon, springarranged intermediately of the disks and secured at one end to the hub.

of one disk and at the other end to the outer portion of the other disk,pawls pivoted on the disks for engaging the sleeve reversely,

the duplex pawl controlling the sleeveengaging pawls for engaging oneand disengag-- ing the other respectively, and means controlled bythesaddle subject to the pressure of the rider thereon for actuatingsaid duplex

